Locking mechanism for a vehicle seat

A locking mechanism (1) for a vehicle seat, particularly for a motor vehicle seat, includes a latch that is to be interlocked with an opposite element (B) and is mounted to be pivotable about a first bearing bolt (13), at least one securing element (25, 31) that secures the latch (11) in the locked state, and a lock housing (5) which supports the latch (11) and the securing element (25, 31). The lock housing (5) has an integrated first stop (5a) for the opposite element (B). The stop (5a) has a damping effect when the opposite element (B) rests against the lock housing (5).

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Description
CROSS REFERENCE TO RELATED APPLICATIONS

This application is a United States National Phase application of International Application PCT/EP2009/004775 and claims the benefit of priority under 35 U.S.C. §119 of German Patent Application DE10 2008 033 305.0 filed Jul. 11, 2008, the entire contents of which are incorporated herein by reference.

FIELD OF THE INVENTION

The invention relates to a locking mechanism for a vehicle seat, in particular for a motor vehicle seat, having a latch for locking to a counter element, which is pivotably mounted about a first bearing pin, has at least one securing element which secures the latch in the locked state, and a lock housing which bears the latch and the securing element.

BACKGROUND OF THE INVENTION

Locking mechanisms of this type are known from use, in which a housing pivotably bears a metal latch, also denoted as a rotary catch, which cooperates with a metal counter element for locking, and a metal securing element which secures the latch in the locked state. The housing bears an unlocking handle in an integrally connected region which is articulated to the securing element by means of a connecting link.

SUMMARY OF THE INVENTION

The object of the invention is to improve a locking mechanism of the type described in the introduction.

According to the invention, A locking mechanism for a vehicle seat, in particular for a motor vehicle seat, is provided with a latch for locking to a counter element, which is pivotably mounted about a first bearing pin, and with at least one securing element which secures the latch in the locked state. A lock housing bears the latch and the securing element. The lock housing has an integrated first stop for the counter element which acts in a damping manner when bearing against the counter element.

The integration of a stop acting in a damping manner has the advantage that, when striking the counter element, the lock housing is specifically (resiliently) deformed, whereby the impact of the counter element is damped. Relative to locking mechanisms with specifically configured cushioning elements attached to the receiver, an integral configuration or at least a material connection of the integrated first stop to the lock housing has the advantage of a smaller number of components. The lock housing in the region of this first stop is configured to be flexible, for example by material recesses being provided.

After the counter element has resiliently deformed the lock housing to a specific degree due to the impact, it preferably strikes a second (metal) stop, for example on a lock cover, which is used to avoid too much deformation and damage to the lock housing by the impact of the counter element. The second stop is located in parallel, adjacent to the first stop, but displaced to the rear by said specific degree in the pivoted-in direction.

Due to its resilience in the contact region with the counter element, the lock housing is used at the same time to ensure that the counter element is free of backlash. In this manner, oblique positions, counter element tolerances and position tolerances of the counter element and of the locking mechanism may be compensated or absorbed.

A separation of the lock housing from the unlocking housing reduces the requirements for materials, in particular with regard to strength requirements in the region of the unlocking. Thus the material of the lock housing may be selected so that said lock housing has improved properties for implementing a stop and damping function. Additionally the geometry is simplified, which simplifies the tool design. The possibility of fastening a separate unlocking housing additionally makes it possible to use different customized variants of the unlocking, with an otherwise identical locking mechanism.

A cap resting on the latch, and which at least partially covers the edge of a hook opening of the latch, reduces the noise generation when the latch and counter element come into contact. Relative to injection-molding, a connection of the cap and latch by means of projections and openings has the advantage that no injection-molding tools with supply of the latches are required, and dimensional inaccuracies and sizing problems due to the thickness tolerances of the metal, significant differences in the shrinkage behavior and disadvantageous strain distribution in the component are avoided.

Various covers of the latch are possible, as are different variants of the connection between the cap and the latch, for example clip connections and ultrasonic riveting. The different variants may be produced in simple injection-molding tools. The variants may be produced on the same assembly unit.

A direct connection of the unlocking handle to one of the securing elements present and thus a direct control of the securing elements by means of the unlocking handle makes intermediate elements, such as a coupling rod or lever kinematics unnecessary, and avoids additional fastening clips or plastic coverings, optionally also mirror-symmetrical parts.

In a preferred embodiment, which is also crash-safe, two securing elements are provided and namely one clamping element which is pretensioned and in the locked state acts on the latch, for example by acting on a functional surface of the latch by means of a clamping surface, and as a result exerting a closing moment on the latch, and a capture element which in the normal case is arranged at a short distance from the latch, in particular the functional surface thereof, and in the event of a crash, in particular by means of a capture surface, supports the latch, in particular on the functional surface thereof, and namely generally positively, so that possible opening of the clamping element counter to the pretensioning thereof has no effect.

The locking mechanism according to the invention may be used at different points of a vehicle seat, for example for attaching the entire vehicle seat to the floor or as a backrest lock for fastening the backrest to the vehicle structure.

The invention is described in more detail hereinafter with reference to exemplary embodiments shown in the drawings. The various features of novelty which characterize the invention are pointed out with particularity in the claims annexed to and forming a part of this disclosure. For a better understanding of the invention, its operating advantages and specific objects attained by its uses, reference is made to the accompanying drawings and descriptive matter in which preferred embodiments of the invention are illustrated.

BRIEF DESCRIPTION OF THE DRAWINGS

In the drawings:

FIG. 1 is a sectional view through the exemplary embodiment in the locked state with a counter element indicated;

FIG. 2 is a sectional view through the exemplary embodiment in the unlocked state;

FIG. 3 is a perspective view of the exemplary embodiment;

FIG. 4 is a partial view of the exemplary embodiment in the region of the lock housing;

FIG. 5 is a sectional view along the line V-V in FIG. 4;

FIG. 6 is a schematic view of a vehicle seat;

FIG. 7 is a side view of the latch with the cap;

FIG. 8 is a perspective view showing an embodiment of the cap; and

FIG. 9 is a perspective view showing an alternative embodiment of the cap.

 DESCRIPTION OF THE PREFERRED EMBODIMENTS

Referring to the drawings in particular, a locking mechanism 1 is provided in a motor vehicle for attaching a backrest 2 of a vehicle seat 3 to the vehicle structure. The locking mechanism 1 has a half-open lock housing 5, with an approximately planar bottom surface and raised edges. The bottom surface is generally arranged in a plane defined by the direction of travel of the motor vehicle and by the vertical, which defines the directional information used hereinafter. The lock housing 5 is substantially closed by a lock cover 6 bearing against the lock housing 5 and approximately parallel to the bottom surface. The lock housing 5 is preferably formed from plastics, optionally with an insert part for increasing the strength, whilst the lock cover 6 is preferably a sheet metal part (steel or aluminum).

The lock housing 5 and the lock cover 6 form a receiver 7 which opens in the direction of a counter element B, in order to receive said counter element for locking. In this case, of the locking mechanism 1 and the counter element B, one is fastened to the structure of the backrest 2 and the other to the vehicle structure. The counter element B may, for example, be a bolt or a clip. The portion of the counter element B to be received by the receiver 7 generally extends horizontally. The direction in which the counter element B is received by the receiver 7 might be denoted as the pivoted-in direction. The dimension of the receiver 7 perpendicular to the pivoted-in direction (and in the plane of the bottom surface of the lock housing 5) is preferably greater than the corresponding diameter of the counter element B for compensating clearance.

The receiver 7 is designed on its base so that, in the pivoted-in direction, the region assigned to the lock cover 6 is set back relative to the region assigned to the lock housing 5. The region assigned to the lock housing 5 is configured as an integrated first stop 5a, against which the counter element B comes to bear when locked. The first stop 5a is configured to be resilient and acts in a damping manner. In the present case, the first stop 5a is formed in one piece with the lock housing 5—preferably consisting of plastics (with an optional insert part) (i.e. the stop 5a during production of the lock housing 5 is configured in one piece with the regions of the lock housing 5 adjacent to the first stop 5a, preferably by an injection-molding method). The region of the lock housing 5 located behind the first stop 5a in the pivoted-in direction has at least one (preferably a plurality of) material recess(es) 5b, which influence the resilient and damping properties of the first stop 5a. The lock housing 5 is, as a result, flexible in the region of the first stop 5a. A second stop 6a is formed on the region of the base of the receiver 7 assigned to the lock cover 6. Depending on the embodiment, the counter element B comes to bear against the second stop 6a during each locking process after deformation of the first stop 5a or only in the event of a crash or misuse.

A latch 11 is pivotably mounted on a first bearing pin 13, which in turn is fastened to the lock housing 5 (and to the lock cover 6) and protrudes perpendicularly from the bottom surface thereof, i.e. extends horizontally. In the present case, the first bearing pin 13, which is preferably metal, is riveted to the lock housing 5 and caulked to the lock cover 6. The first bearing pin 13 is preferably of hollow configuration, in order to receive a fastening means, for example a screw, by means of which the locking mechanism 1 is fastened during assembly to the associated structure. The latch 11 has a hook opening 15 for cooperating with the counter element B.

On the latch 11 which is preferably made of metal (or of a different hard material) sits a cap 17, preferably an injection-molded part made of plastics (or a part made of a different soft material). The cap 17 which is formed in one piece has a planar, flat region 17a which partially covers the side of the latch 11 (i.e. on one side) remote from the lock housing 5, an edge region 17b protruding therefrom (preferably in a perpendicular manner), which (at least partially) covers the edge of the hook opening 15 and at least one projection 17c for fastening to the latch 11. In the present case, the cap 17 has two projections 17c (or two pairs of projections 17c), which protrude parallel to the first bearing pin 13 from the flat region of the cap 17. Each projection 17c (or each pair of projections 17c as shown in FIG. 9) is inserted through a suitable opening in the latch 11 and (preferably positively) connected to the latch 11, for example clipped or preferably connected by ultrasonic-riveting, by means of a sonotrode. The cap 17 acts in a noise-damping manner when the counter element B is received by the hook opening 15 and comes to bear against the edge of the hook opening 15 (covered by the cap 17, i.e. covered by the edge region 17b thereof).

In the closed position of the latch 11, the hook opening 15 traverses the receiver 7 in an approximately perpendicular manner and is open to the side. The dimension of the hook opening 15 (together with the cap 17) aligned in the pivoted-in direction is slightly greater than the diameter of the counter element B, whereby the edge of the hook opening 15 located further to the inside in the pivoted-in direction, is set back relative to the stop 5a, so that the counter element B in the locked state of the locking mechanism 1 only bears against the stop 5a and not against said edge of the hook opening 15 located further to the inside in the pivoted-in direction. In the open position of the latch 11, the hook opening 15 is open obliquely relative to the pivoted-in direction and traverses the receiver 7 in an oblique manner. The latch 11 is preferably pretensioned in the direction of the open position.

The latch 11 has a functional surface 21 which in the locked position faces approximately in the direction of a second bearing pin 23, which is arranged parallel to the first bearing pin 13 and is fastened in the same manner to the lock housing 5 (and to the lock cover 6). If an insert part is provided in the lock housing 5, said insert part preferably holds the two bearing pins 13 and 23 at a defined distance from one another. The functional surface 21 is, for example, curved in the shape of a circular arc and of concave configuration but may also be planar. On the second bearing pin 23 a clamping element 25 is pivotably mounted, which is pretensioned toward the latch 11. In the locked state the clamping element 25 exerts a closing moment on the latch 11 as a securing element by means of a clamping surface 29 curved eccentrically to the second bearing pin 23, which is in non-self-locking contact with the functional surface 21. The clamping surface 29 is, for example, curved in the shape of a circular arc and of convex configuration.

A capture element 31 is arranged (relative to the second bearing pin 23) axially adjacent to the clamping element 25 on the side remote from the lock housing 5, and also pivotably mounted on the second bearing pin 23, i.e. aligned with the clamping element 25. The capture element 31 has a capture surface 33 which is located in the vicinity of the clamping surface 29, but in the locked state is spaced apart from the functional surface 21. The capture surface 33 is, for example, curved in the shape of a circular arc and of convex configuration, but may also be planar. The capture element 31 may be mounted in its center of gravity. The capture element 31 and the clamping element 25 are mechanically connected to one another with free travel, for example by means of a slot-pin guide or an axially protruding drive element. In the event of a crash, if the latch 11 were to be subjected to an opening moment and push the clamping element 25 slightly away, the capture surface 33 would come to bear against the functional surface 21, without an opening moment being able to be transmitted. Thus the capture element 31 serves for supporting the latch 11 and as a further securing element prevents an opening thereof.

The locking mechanism 1 further comprises an unlocking housing 40 which is configured separately and is fastened to the upper end of the lock housing 5 and the lock cover 6. In the present case, the unlocking housing 40 is pushed in the horizontal direction (“laterally”) onto the lock housing 5 and clipped to the lock cover 6, the clipped connection between the lock housing 5 and the lock cover 6 being secured against a release of the connection by pushing on the unlocking housing 40. The unlocking housing 40 is substantially configured as a vertical duct, within which an unlocking handle 42 is arranged and is accessible—generally from above. The unlocking handle 42 is mounted in the unlocking housing 40, manually pivotable about an unlocking axis 43 parallel to the bearing pins 13 and 23. Resiliently coupled to the unlocking handle 42 is an indicator 45 which is guided in a longitudinally displaceable manner in the unlocking housing 40, and may partially extend from said unlocking housing in order to display the unlocked state of the locking mechanism 1. The resilient coupling of the indicator 45 has the purpose of avoiding damage to the extended indicator 45 in the event of misuse. The resilient coupling is implemented, for example, by means of a spring or a further resilient element, by means of which the unlocking handle 42 activates and extends the indicator 45. According to the type and geometry of the resilient element, for retracting the indicator 45, i.e. when the locked state of the locking mechanism 1 has to be displayed, temporary, positive contact may be provided between the indicator 45 and the unlocking handle 42. The indicator 45 is at least partially colored in a signal color which is preferably clearly differentiated from the color of the unlocking housing 40 or the covers thereof.

The unlocking handle 42 has at its lower end an actuating element 46. The actuating element 46 is in the present case configured as an integrally formed pin, which protrudes parallel to the unlocking axis 43 from the unlocking handle 42. The actuating element 46 acts in an articulated manner on the capture element 31 so that a direct point of articulation 48 between the unlocking handle 42 and the capture element 31 is formed. The point of articulation 48 is arranged offset (parallel) to the unlocking axis 43. In the present case, the point of articulation 48 is produced by the rounded actuating element 46 coming to rest in a radiused jaw-like receiver of the capture element 31. By the defined relative position of the second bearing pin 23 and the unlocking axis 43, the point of articulation 48 is maintained in all positions. However, optional securing is possible by the lips of the jaw-like receiver of the capture element 31 engaging behind the actuating element 46 after the resilient deformation thereof.

In the locked state of the locking mechanism 1, the counter element B is located in the receiver 7 and in the hook opening 15 of the closed latch 11, the clamping element 25 secures the latch 11, the capture element 31 is slightly spaced apart from the functional surface 21, the unlocking handle 42 is in its initial position and the indicator 45 is retracted. If the unlocking handle 42 is pivoted, the indicator 45 is extended, and by means of the point of articulation 48 the capture element 31 is also pivoted, i.e. the capture surface 33 moves away from the functional surface 21. The capture element 31 drives the clamping element 25, so that the latch 11 is no longer secured. Driven by one of the two securing elements or by individual pretensioning, the latch 11 opens. Due to the pivoting motion of the latch 11, the hook opening 15 is pulled back from the receiver 7 and releases the counter element B, which moves away relative to the locking mechanism 1 counter to the pivoted-in direction. Preferably, in the unlocked state of the locking mechanism 1 the latch 11 and the capture element 31 bear against one another for mutual support at a point which in each case is different from the functional surface 21 and the capture surface 33, so that the hook opening 15 remains in a ready-to-receive state.

If in this unlocked state the counter element B again enters the receiver 7 and comes to bear against the edge (covered by the cap 17) of the hook opening 15, the counter element B presses the latch 11 into its closed position. The clamping element 25 moves (due to its pretensioning) along the functional surface 21, as does the capture element 31 which is driven by the clamping element 25 or pivots due to its own pretensioning, whereby said two securing elements secure the latch 11 again. The pivoting capture element 31 pivots the unlocking handle 42 again into its initial position which at the same time retracts the indicator 45.

While specific embodiments of the invention have been described in detail to illustrate the application of the principles of the invention, it will be understood that the invention may be embodied otherwise without departing from such principles.

Claims

1. A locking mechanism for a motor vehicle seat, the locking mechanism comprising:

a counter element;
a latch for locking to the counter element, the latch being pivotably mounted about a bearing pin;
at least one securing element which secures the latch in a locked state in which said latch is locked to said counter element;
a lock housing, which bears the latch and the at least one securing element, the lock housing having an integrated stop for the counter element, which acts in a damping manner when bearing against the counter element, wherein a region of said lock housing located behind said integrated stop has at least one material recess; and
a lock cover, wherein the lock housing is configured to be half-open and is at least substantially closed by the lock cover, said lock cover having another stop against which the counter element comes to bear after deformation of the integrated stop, said at least one securing element comprising a clamping element and a capture element, wherein when the latch is in the locked state, said clamping element is pretensioned in a normal case exerting a closing moment on said latch and in the event of a crash, said capture element supports said latch, said clamping element and said capture element being both pivotably mounted about another bearing pin and said capture element being arranged, relative to said another bearing pin, axially adjacent to said clamping element on a side of said clamping element remote from said lock housing, wherein said capture element and said clamping element are mechanically connected to one another with free travel via a slot-pin guide.

2. The locking mechanism as claimed in claim 1, wherein the integrated stop is resiliently deformed when bearing against the counter element.

3. The locking mechanism as claimed in claim 1, further comprising a separately configured unlocking housing; and

an unlocking handle mounted to the unlocking housing.

4. The locking mechanism as claimed in claim 3, wherein the unlocking housing is fastened to the lock housing and/or to the lock cover.

5. The locking mechanism as claimed in claim 3, wherein the unlocking housing is pushed onto and/or clipped to the lock housing and/or the lock cover.

6. The locking mechanism as claimed in claim 3, wherein the unlocking handle is directly articulated to said capture element, by means of a single point of articulation, said unlocking handle comprising an actuating element, said capture element comprising an actuating element receiving portion, said actuating element engaging said actuating element receiving portion, said actuating element receiving portion and said actuating element defining said single point of articulation.

7. The locking mechanism as claimed in claim 1, wherein a cap is located on the latch, said cap at least partially covering an edge of a hook opening of the latch.

8. The locking mechanism as claimed in claim 1, wherein said another bearing pin is arranged parallel to the bearing pin, each of said capture element and said clamping element being independently movable when the latch is in the locked state.

9. The locking mechanism as claimed in claim 1, wherein the latch has a common functional surface for interaction with the clamping element and with the capture element.

10. A vehicle seat comprising:

a backrest; and
a locking mechanism for attaching said backrest to a vehicle structure, the locking mechanism comprising:
a counter element;
a latch for locking to the counter element, the latch being pivotably mounted about a bearing pin;
at least one securing element which secures the latch in a locked state in which said latch is locked to said counter element;
a lock housing, which bears the latch and the at least one securing element, the lock housing having at least one material recess and an integrated stop for the counter element, which acts in a damping manner when bearing against the counter element, said at least one material recess being adjacent to said integrated stop; and
a lock cover, wherein the lock housing is configured to be half-open and is at least substantially closed by the lock cover, said lock cover having another stop against which the counter element comes to bear after deformation of the integrated stop, said at least one securing element comprising a clamping element and a capture element, wherein when the latch is in said locked state, said clamping element is pretensioned in a normal case exerting a closing moment on said latch and in the event of a crash, said capture element supports said latch, said clamping element and said capture element being pivotably mounted about another bearing pin, said capture element being arranged, relative to said another bearing pin, axially adjacent to said clamping element, with respect to a longitudinal axis of said another bearing pin, on a side of said clamping element remote from said lock housing, wherein said capture element and said clamping element are mechanically connected to one another with free travel via a slot-pin guide.

11. The locking mechanism as claimed in claim 10, wherein the integrated stop is resiliently deformed when bearing against the counter element.

12. The locking mechanism as claimed in claim 10, further comprising:

a separately configured unlocking housing; and
an unlocking handle mounted to the unlocking housing, wherein the unlocking housing is fastened to the lock housing and/or to the lock cover, wherein the unlocking handle is directly articulated to said capture element by means of a single point of articulation, said unlocking handle comprising an actuating element, said at least one securing element comprising an actuating element receiving portion, said actuating element engaging said actuating element receiving portion, said actuating element receiving portion and said actuating element defining said single point of articulation.

13. A locking mechanism for a motor vehicle seat, the locking mechanism comprising: a counter element; a latch for locking to the counter element, the latch being pivotably mounted about a bearing pin; a clamping element; a capture element, at least one of said clamping element and said capture element securing the latch in a locked state in which said latch is locked to said counter element, said clamping element and said capture element being pivotably mounted about another bearing pin such that said clamping element and said capture element are movable relative to each other when the latch is in said locked state, said capture element being arranged axially adjacent to said clamping element with respect to an axial direction of said another bearing pin, wherein when the latch is in said locked state, said clamping element is pretensioned in a normal case such that said clamping element applies a closing force on said latch, said capture element supporting said latch in the event of a crash, said capture element and said clamping element being mechanically connected to one another via a slot-pin guide; a lock housing connected to said latch, said clamping element and said capture element, said lock housing having an integrated stop for the counter element, which acts in a damping manner when bearing against the counter element, said lock housing having a lock housing surface adjacent to said integrated stop, said lock housing surface defining at least one recess adjacent to said integrated stop; and an unlocking handle having a least a portion integrally connected to said unlocking handle to form a one-piece unlocking handle structure, wherein said at least said portion of said unlocking handle directly engages said capture element.

14. The locking mechanism as claimed in claim 13, wherein said unlocking handle directly engages said capture element by means of a single connection point, said at least said portion of said unlocking handle comprising an actuating element, said capture element comprising an actuating element receiving portion, said actuating element engaging said actuating element receiving portion, said actuating element receiving portion and said actuating element defining said single connection point.

15. The locking mechanism as claimed in claim 13, wherein said clamping element is movable independent of movement of said capture element in said locked state, said clamping element being arranged relative to said capture element.

16. The locking mechanism as claimed in claim 15, wherein said latch has a functional surface, said capture element has a capture element surface, said capture element surface is located at a spaced location from said functional surface when the latch is in said locked state, said capture element surface engaging said functional surface in a crash state.

17. The locking mechanism as claimed in claim 16, wherein said unlocking handle is pivotable about an unlocking handle axis, said at least said portion of said unlocking handle comprising an unlocking handle pin extending parallel to said unlocking handle axis.

18. The locking mechanism as claimed in claim 17, wherein said unlocking handle pin engages said capture element.

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Patent History
Patent number: 9039048
Type: Grant
Filed: Jul 2, 2009
Date of Patent: May 26, 2015
Patent Publication Number: 20110006577
Assignee: Johnson Controls Components GmbH & Co. KG. (Kaiserslautern)
Inventors: Peter Müller (Mackenbach), Olaf Kreuels (Zweibrücken), Stefan Haber (Primasens), Volker Windecker (Sippersfeld), Denise Schmitt (Sippersfeld)
Primary Examiner: Carlos Lugo
Assistant Examiner: Alyson M Merlino
Application Number: 12/922,519
Classifications
Current U.S. Class: Closure (292/216); 292/DIG.065; Disengages Holding Abutment Rearwardly Of Pivot (297/336); Seat Securing Device Permitting Seat Removal And Replacement (296/65.03)
International Classification: E05C 3/16 (20060101); B60N 2/015 (20060101); B60N 2/36 (20060101); B60N 2/02 (20060101);